@media screen and (max-width: 800px) {
  .left_div {
    display: none;
    position: absolute;
    width: 6rem;
    height: 100%;
    background-color: #ffffff;
    box-shadow: 0 0 0.1rem 0 rgba(0, 0, 0, 0.2);
    -webkit-box-shadow: 0 0 0.1rem 0 rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0 0 0.1rem 0 rgba(0, 0, 0, 0.2);
  }
  .left_div ul li {
    height: 1.2rem;
    border-top: 0.01rem solid #f3f3f3;
    line-height: 1.2rem;
  }
  .left_div ul li:hover {
    background: #f5f5f5;
  }
  .left_div ul .group {
    font-size: 0.6rem;
    font-weight: 600;
    color: #262626;
    padding-left: 0.1rem;
  }
  .left_div ul .group img {
    width: 0.5rem;
    height: 0.5rem;
    vertical-align: middle;
    margin-right: 0.1rem;
  }
  .left_div ul .chirld {
    font-weight: 600;
    font-size: 0.58rem;
    color: #262626;
    padding-left: 0.1rem;
  }
  .left_div ul .chirld img {
    display: inline-block;
    height: 1.2rem;
    vertical-align: middle;
  }
}
@media screen and (min-width: 800px) {
  .left_div {
    position: absolute;
    width: 2.2rem;
    height: 100%;
    background-color: #ffffff;
    box-shadow: 0 0 0.1rem 0 rgba(0, 0, 0, 0.2);
    -webkit-box-shadow: 0 0 0.1rem 0 rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0 0 0.1rem 0 rgba(0, 0, 0, 0.2);
  }
  .left_div ul li {
    height: 0.37rem;
    border-top: 0.01rem solid #f3f3f3;
    line-height: 0.37rem;
  }
  .left_div ul li:hover {
    background: #f5f5f5;
  }
  .left_div ul .group {
    font-size: 0.2rem;
    font-weight: 600;
    color: #262626;
    padding-left: 0.1rem;
  }
  .left_div ul .group img {
    width: 0.2rem;
    height: 0.2rem;
    vertical-align: middle;
    margin-right: 0.1rem;
  }
  .left_div ul .chirld {
    font-weight: 600;
    font-size: 0.18rem;
    color: #262626;
    padding-left: 0.1rem;
  }
  .left_div ul .chirld img {
    display: inline-block;
    height: 0.37rem;
    vertical-align: middle;
  }
}
